量子电子学报 ›› 2022, Vol. 39 ›› Issue (4): 651-661.doi: 10.3969/j.issn.1007-5461.2022.04.021

• 纤维与波导光学 • 上一篇    下一篇

保偏负曲率光纤的双折射特性分析

张正雄, 陈吴, 佟亮, 代问问, 刘韶清, 郑子其, 叶珊珊, 王洋洋, 蒋文辉, 高伟清∗   

  1. ( 合肥工业大学电子科学与应用物理学院光学工程系, 安徽合肥230601 )
  • 收稿日期:2021-02-01 修回日期:2021-03-08 出版日期:2022-07-28 发布日期:2022-07-28
  • 通讯作者: gaoweiqing@hfut.edu.cn E-mail:gaoweiqing@hfut.edu.cn
  • 作者简介:张正雄( 1995 - ), 云南宣威人, 研究生, 主要从事光纤器件方面的研究工作。 E-mail: zzx@mail.hfut.edu.cn
  • 基金资助:
    Supported by National Natural Science Foundation of China (国家自然科学基金, 61875052, 61905059), Anhui Provincial Natural Science Foundation (安徽省自然科学基金, 1908085QF273), Fundamental Research Funds for the Central Universities (中央高校科研业务费, PA2019GDQT0007, JZ2020HGTB0065, JZ2020HGQA0163)

Analysis on birefringence characteristics of polarization-maintaining negative curvature fiber

ZHANG Zhengxiong, CHEN Wu, TONG Liang, DAI Wenwen, LIU Shaoqing, ZHENG Ziqi, YE Shanshan, WANG Yangyang, JIANG Wenhui, GAO Weiqing∗   

  1. ( Department of Optical Engineering, School of Electronic Science & Applied Physics, Hefei University of Technology, Hefei 230601, China )
  • Received:2021-02-01 Revised:2021-03-08 Published:2022-07-28 Online:2022-07-28

摘要: 设计了一种具有偏振滤波特性和保偏特性的空芯负曲率光纤(HC-NCF), 并对其特性进行了分析。通过 引入内包层管破坏常规HC-NCF 的对称性, 使两个正交方向的基模和内包层玻璃管模式进行耦合, 从而增加两 个偏振方向的折射率和损耗差异。进而对光纤双折射特性和损耗的影响因素进行分析, 包括内包层管的壁厚、 内包层管的内直径和纤芯直径。结果表明, 当光纤纤芯直径和外包层管环内直径为30 m, 外包层和内包层管环 壁厚分别为1.116 m 和1.56 m, 内包层管的内直径为9 m 时, 在1.55 m 波长处双折射达到1:33 × 10−4,基 模x 偏振和y 偏振方向的偏振消光比达到4723 (36.7 dB),并且偏振消光比大于100 的带宽为7 nm。此外, 1.55 m 波长处的最低损耗约为0.03 dB/m。这种保偏HC-NCF 可应用于对偏振敏感的光纤器件。

关键词: 物理光学, 负曲率光纤, 双折射, 限制损耗, 偏振滤波

Abstract: A kind of hollow-core negative curvature fiber (HC-NCF) with polarization filtering and polarization maintaining characteristics is designed, and its characteristics are analyzed. By introducing an inner cladding ring to break the symmetry of the conventional negative curvature fiber, the fundamental mode and the inner cladding glass mode in two orthogonal directions are coupled, which increases the birefringence and loss ratio in the two polarization directions. Then the influence factors of fiber birefringence characteristics and loss are analyzed, including the wall thickness, the inner diameter of the inner cladding tube, and the core diameter. The results show that when the fiber core diameter and the inner diameter of the outer cladding tube ring are 30 m, the wall thickness of the outer cladding and inner cladding tube ring are 1.116 m and 1.56 m, respectively, and the inner diameter of the inner cladding tube ring is 9 m, the birefringence at 1.55 m reaches 1:33 × 10−4, the polarization extinction ratio in the x polarization and y polarization directions of the fundamental mode reaches 4723 (36.7 dB), and the bandwidth with polarization extinction ratio greater than 100 is 7 nm. In addition, the minimum loss at 1.55 m is as low as 0.03 dB/m. It is shown that this kind of polarization maintaining negative curvature fiber can be used in fiber devices that are sensitive to polarization.

Key words: physical optics, negative curvature fibers, birefringence, confinement loss, polarization filter

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